A dynamic separation nanomill bead filtration system and method of use

Abstract

The application relates to the raw material processing field, in particular to a filter bead system for a dynamic separation nanometer grinding machine and a use method thereof, wherein the system comprises a grinding cylinder, a grinding rotor arranged in the grinding cylinder and a dynamic separator, one end of the grinding cylinder is provided with a feeding port, the other end is provided with a discharging port, the discharging port is connected with a vertically arranged filter bead tank through a feeding pipe, and a pressure maintaining valve is arranged on the feeding pipe; after the pressure maintaining valve is opened, the mixture flowing out of the discharging port enters the filter bead tank, and the filter bead tank is filled with the material overflowing from the upper end and collected. The pressure maintaining valve is arranged on the feeding pipe between the discharging port of the grinding cylinder and the filter bead tank, so that the grinding cylinder is pressure maintained, thereby the risk of leakage of the filter bead to the filter bead tank can be reduced to the maximum extent; meanwhile, a filter screen is arranged on the discharging pipe of the filter bead tank, thereby becoming an insurmountable barrier for the leakage of the filter bead to the downstream process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of raw material processing, in particular to a filter bead system for dynamic separation nanometer grinding machine and a use method thereof. BACKGROUND

[0002] Currently, in the field of raw material processing such as raw material ball milling, when the material is ground to a fineness below 200 nm, 0.2 mm or smaller grinding media such as zirconium beads are needed for grinding. However, when using these small-diameter grinding media, the conventional static gap separator is prone to clogging the separator, causing the discharge to be not smooth or the material to be blocked. For this situation, the industry solution is to use dynamic separation method for grinding media and material separation when grinding to 200 nm or below or using 0.2 mm or smaller grinding media. This separation method relies on the centrifugal force generated by the high-speed rotation of the separator to throw the grinding media with high specific gravity to the outer layer. However, since the dynamic separation sand mill uses an open-type separator, grinding media leakage may occur during start-up or speed reduction, or when using certain special materials. To address the grinding media leakage, the existing solution is to design different specifications of separators and set the optimal dynamic separation speed by different separation speeds to reduce the amount of grinding media leakage. However, even so, a lot of grinding media still leaks into the downstream process with the continuous start-up and speed reduction of the equipment. SUMMARY

[0003] To solve the above technical problems, the present application provides a filter bead system for dynamic separation nanometer grinding machine which can effectively reduce grinding media leakage and be recycled, and a use method thereof.

[0004] The technical solution adopted by the present application to solve the above technical problems is as follows: a filter bead system for dynamic separation nanometer grinding machine, comprising a grinding cylinder, a grinding rotor and a dynamic separator arranged in the grinding cylinder. One end of the grinding cylinder is provided with a feed inlet, and the other end is provided with a discharge outlet. The material entering the grinding cylinder from the feed inlet is mixed with filter beads and ground by the grinding rotor, and then separated by the dynamic separator and discharged from the discharge outlet. The discharge outlet is connected to a vertically arranged filter bead tank through a feed pipe, and a pressure retaining valve is installed on the feed pipe. After opening the pressure retaining valve, the mixture discharged from the discharge outlet enters the filter bead tank. When the filter bead tank is filled, the material overflows from the upper end of the filter bead tank and is collected. The material and filter bead mixture at the lower end of the filter bead tank are transported to the feed inlet for recycling.

[0005] As a preferred embodiment, one end of the feed pipe is connected to the discharge outlet, and the other end is connected to the upper end of the filter bead tank. The pressure retaining valve installed on the feed pipe is an automatic valve.

[0006] As a preferred embodiment, the other end of the feed pipe is tangentially connected to the tank wall of the filter bead tank.

[0007] Preferably, the filter bead tank is connected with a discharge pipe at the upper end, and a filter screen is arranged on the discharge pipe.

[0008] Preferably, a feeding pipe is arranged at the lower end of the filter bead tank, and a discharge valve is arranged on the feeding pipe.

[0009] Preferably, after the discharge valve is opened, the mixture of the material and the filter beads is delivered to the feeding port by the feeding pump.

[0010] Preferably, the nano-grinding machine is a vertical grinding machine or a horizontal grinding machine.

[0011] The application also provides a use method of the dynamic separation filter bead system of the nano-grinding machine, which comprises the following steps: firstly, opening the pressure maintaining valve, mixing the material in the grinding cylinder with the filter beads, and rotating and grinding the mixture under the driving of the grinding rotor; then, separating the ground material and the filter beads by the dynamic separator; after the separation, the material flows into the filter bead tank through the discharge port; and after the filter bead tank is filled, the material overflows from the upper end of the filter bead tank, is filtered by the filter screen, and then enters the discharge pipe.

[0012] Further, the method further comprises the following steps:

[0013] (1) firstly, closing the pressure maintaining valve, and then, shutting down the nano-grinding machine;

[0014] (2) after the nano-grinding machine stops working, opening the pressure maintaining valve, and automatically flowing the mixture in the grinding cylinder into the filter bead tank through the discharge port;

[0015] (3) collecting the material from the upper end of the filter bead tank, and recovering the mixture of the material and the filter beads from the lower end of the filter bead tank;

[0016] (4) closing the pressure maintaining valve, and starting the nano-grinding machine;

[0017] (5) after the pressure in the grinding cylinder is stabilized, opening the pressure maintaining valve, and then, collecting the material from the upper end of the filter bead tank.

[0018] Preferably, when the mixture of the material and the filter beads is recovered, the pressure maintaining valve is closed first, then the discharge valve at the lower end of the filter bead tank is opened, and then the feeding pump is started to deliver the mixture of the material and the filter beads to the feeding port of the nano-grinding machine.

[0019] As can be seen from the above technical solution, the pressure maintaining valve is arranged on the feeding pipe between the discharge port of the grinding cylinder and the filter bead tank, so as to maintain the pressure of the grinding cylinder, thereby minimizing the risk of leakage of the filter beads to the filter bead tank; meanwhile, the filter screen is arranged on the discharge pipe of the filter bead tank, thereby becoming an insurmountable barrier for the leakage of the filter beads to the downstream process; and the feeding pipe, the discharge valve and the feeding pump are arranged at the lower side of the filter bead tank, so as to realize the recovery of the filter beads, thereby ensuring that each batch of material will not affect the efficiency of the equipment due to the reduction of the grinding medium. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the system of the present application.

[0021] Figure 2 is a schematic diagram of the internal working of the system of the present application. DETAILED DESCRIPTION

[0022] The present application will be described in detail below with reference to the accompanying drawings, in which the schematic embodiments and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0023] The present application provides a filter bead system for a dynamic separation nanometer grinder, which can be a vertical grinder or a horizontal grinder. The present embodiment takes the horizontal grinder as an example, referring to Figure 1 、 Figure 2 which comprises a grinding cylinder 1, a grinding rotor 2 and a dynamic separator 3 arranged in the grinding cylinder. One end of the grinding cylinder is provided with a feeding port 4, and the other end is provided with a discharging port 5. The material entering the grinding cylinder from the feeding port is mixed with filter beads and is ground by the grinding rotor, and then is separated by the dynamic separator and flows out from the discharging port. The filter beads of the grinding medium of the present application are zirconium beads with a diameter of 0.2 mm or less, so as to ensure that the product after grinding reaches the nanometer level. In the implementation process, the discharging port is connected with a vertically arranged filter bead tank 7 through a conveying pipe 6, and a pressure maintaining valve 8 is installed on the conveying pipe. During the operation of the nanometer grinder, a certain pressure is generated in the grinding cylinder. Therefore, when the equipment is stopped, the pressure in the grinding cylinder will be released to the discharging port end of the grinder. At this time, since the dynamic separator almost stops, it cannot generate centrifugal force to prevent the filter beads from entering. Therefore, a large amount of filter beads will gather at the inlet of the dynamic separator and squeeze into the discharging port, causing filter bead leakage. Therefore, the present application is provided with a pressure maintaining valve on the conveying pipe between the discharging port of the grinding cylinder and the filter bead tank, so as to maintain the pressure of the grinding cylinder. That is, when the nanometer grinder is about to be stopped or reduced in speed, the pressure maintaining valve is first closed, so that a certain pressure is maintained in the grinding cylinder, thereby avoiding the gathering of a large amount of filter beads at the inlet of the dynamic separator, and effectively reducing the leakage of a large amount of filter beads during the stopping or speed reduction process.

[0024] In the implementation process, after the pressure-keeping valve is opened, the mixture flowing out of the discharge port enters the filter bead tank, and after the filter bead tank is filled, the material overflows from the upper end of the filter bead tank and is collected to obtain the product; the material and filter bead mixture at the lower end of the filter bead tank are transported to the feeding port for recycling. Since it is impossible to completely prevent the leakage of filter beads, when the pressure-keeping valve is opened, a small amount of filter beads may be mixed in the material at the discharge port and enter the filter bead tank, so that the present application recycles the material and filter beads in the filter bead tank to ensure that each batch of material does not affect the efficiency of the equipment due to the reduction of the grinding medium. As a preferred embodiment, one end of the material conveying pipe is connected to the discharge port, and the other end is connected to the upper end of the filter bead tank, so that the material can be settled by using the vertically arranged filter bead tank, and then the product of qualified fineness is collected from the upper end of the filter bead tank. The pressure-keeping valve installed on the material conveying pipe can be an automatic valve or a manual valve. When an automatic valve is used, when the pressure in the grinding cylinder decreases to a set value, the control center of the nanometer grinding machine controls the automatic valve to automatically close; similarly, when the pressure in the grinding cylinder increases to a set value, the automatic valve can be automatically opened.

[0025] The other end of the material conveying pipe of the present application is tangentially connected to the tank wall of the filter bead tank, which can make the material flow down along the inner wall of the filter bead tank, improving the settling effect. As a preferred embodiment, a discharge pipe 9 is connected to the upper end of the filter bead tank, and a filter screen 10 is arranged on the discharge pipe. In the implementation process, even if the material mixed with a small amount of filter beads flows into the filter bead tank and does not sink with gravity due to various factors and overflows from the upper end of the filter bead tank with the material, it will be blocked by the filter screen, thereby further preventing the grinding medium from flowing into the next process.

[0026] As a preferred embodiment, a feeding pipe 11 is arranged at the lower end of the filter bead tank, and a discharge valve 12 is arranged on the feeding pipe. When the discharge valve is opened, the material and filter beads in the filter bead tank can be transported into the grinding cylinder, thereby realizing the recycling of the filter beads. Specifically, after the discharge valve is opened, the material and filter bead mixture is transported to the feeding port by a conveying pump 13, and then flows into the grinding cylinder. In the implementation process, a small amount of filter beads entering the filter bead tank sink to the lower part of the filter bead tank under the action of the filter screen and gravity. After the grinding of the current batch of material is completed, the discharge valve is opened, and the material and filter beads are transported to the feeding port by the conveying pump, thereby realizing the recycling of the filter beads.

[0027] The present application also provides a use method of the filter bead system of the above-mentioned dynamic separation nanometer grinding machine. First, the pressure-keeping valve is opened, the material in the grinding cylinder is mixed with the filter beads and rotates under the driving of the grinding rotor, then the ground material and filter beads are separated by the dynamic separator, the separated material flows into the filter bead tank through the discharge port, and after the filter bead tank is filled, the material overflows from the upper end of the filter bead tank, is filtered by the filter screen, and then enters the discharge pipe to collect the ground product in the discharge pipe.

[0028] Further, the method of using the above system of the present application further comprises the following steps:

[0029] First, the pressure maintaining valve is closed, and then the nano-mill is shut down, so that the grinding cylinder has a certain pressure to prevent the filter beads from leaking; after the nano-mill stops working, the pressure maintaining valve is opened, and the mixture in the grinding cylinder automatically flows into the filter bead tank through the discharge port, at this time, a very small amount of filter beads may flow into the filter bead tank; then the material is collected from the upper end of the filter bead tank in the above manner to obtain the product; at the same time, the mixture of the material and the filter beads can be recovered from the lower end of the filter bead tank, thereby completing a batch of production. When the next batch of production is carried out, the pressure maintaining valve is closed first, and then the nano-mill is started, so that the grinding cylinder has a certain pressure as soon as the nano-mill is started, further preventing the filter beads from leaking; after the pressure in the grinding cylinder is stable, the pressure maintaining valve is opened, and then the material is collected from the upper end of the filter bead tank. As a preferred embodiment, when the mixture of the material and the filter beads is recovered, the pressure maintaining valve is closed first to prevent the material in the grinding cylinder from entering the filter bead tank, then the discharge valve at the lower end of the filter bead tank is opened, and then the material and the filter bead mixture are pumped to the feed port of the nano-mill by the material pump to realize the recovery of the filter beads, thereby ensuring that the efficiency of the equipment is not affected by the decrease of the grinding medium in each batch of material.

Claims

1. A dynamic separation filter bead system for a nanomill, comprising a grinding cylinder, a grinding rotor arranged in the grinding cylinder, and a dynamic separator, one end of the grinding cylinder being provided with a feeding port and the other end being provided with a discharging port, material entering the grinding cylinder from the feeding port being mixed with filter beads and being ground by the grinding rotor, and then being separated by the dynamic separator and flowing out of the discharging port, characterized in that: The discharge port is connected with a vertically arranged filter bead tank through a material conveying pipe, and a pressure maintaining valve is installed on the material conveying pipe; after the pressure maintaining valve is opened, the mixture flowing out of the discharge port enters the filter bead tank, and after the filter bead tank is filled, the material overflows from the upper end of the filter bead tank and is collected, and the mixture of the material and filter beads at the lower end of the filter bead tank is conveyed to the feeding port for recycling. ​ 2. The filter bead system for dynamic separation nanomill according to claim 1, characterized in that: The pressure maintaining valve installed on the material conveying pipe is an automatic valve.

3. The filter bead system for dynamic separation nanomill according to claim 1, wherein: The other end of the material conveying pipe is tangentially connected with the tank wall of the filter bead tank.

4. The filter bead system for dynamic separation nanomill according to claim 1 or 2 or 3, characterized in that: The upper end of the filter bead tank is connected with a discharge pipe, and a filter screen is arranged on the discharge pipe.

5. The filter bead system for dynamic separation nanomill according to claim 1 or 2 or 3, characterized in that: The lower end of the filter bead tank is provided with a feeding pipe, and a discharge valve is arranged on the feeding pipe.

6. The filter bead system for dynamic separation nanomill according to claim 5, characterized in that: After the discharge valve is opened, the mixture of the material and filter beads is conveyed to the feeding port by the material conveying pump.

7. The filter bead system for dynamic separation nanomill according to claim 1, wherein: The nano grinder is a vertical grinder or a horizontal grinder.

8. A method of using the filter bead system of the dynamic separation nanomill according to any one of claims 1 to 7, characterized in that: First, the pressure maintaining valve is opened, the material in the grinding cylinder is mixed with filter beads and is rotated and ground under the driving of the grinding rotor, then the ground material and filter beads are separated by the dynamic separator, the separated material flows into the filter bead tank through the discharge port, and after the filter bead tank is filled, the material overflows from the upper end of the filter bead tank and enters the discharge pipe after being filtered by the filter screen.

9. The method of use of claim 8, wherein The method comprises the following steps: (1) first, the pressure maintaining valve is closed, and then the nano grinder is shut down; (2) after the nano grinder stops working, the pressure maintaining valve is opened, and the mixture in the grinding cylinder automatically flows into the filter bead tank through the discharge port; (3) the material is collected from the upper end of the filter bead tank, and the mixture of the material and filter beads is recycled from the lower end of the filter bead tank; (4) the pressure maintaining valve is closed, and the nano grinder is started; (5) after the pressure in the grinding cylinder is stabilized, the pressure maintaining valve is opened, and the material is collected from the upper end of the filter bead tank.

10. The method of use of claim 9, wherein: When the mixture of the recycled material and filter beads is collected, the pressure maintaining valve is closed first, then the discharge valve at the lower end of the filter bead tank is opened, and then the material conveying pump is started to convey the mixture of the material and filter beads to the feeding port of the nano grinder.

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